A ringfort, or rath, was a roughly circular enclosed farmstead of early medieval Ireland, defined typically by a bank and ditch that enclosed a family's dwelling and outbuildings. Here at Dromsullivan, that enclosure, once roughly 27 metres north to south and 28 metres east to west, has sunk so far back into the pasture that it reads today as little more than a faint depression, most legible along its northern edge.

The site was considered significant enough to be marked with hachures on the first edition Ordnance Survey map, the hatched lines that cartographers used to indicate earthworks and raised ground, which suggests it retained some visible form into the nineteenth century. By the time Myler wrote about it in 1998, that visibility had gone entirely; the record notes directly that no surface trace was then evident. What survives now is essentially a ghost of a boundary, a slight hollow in grazing land that betrays the outline of a place where someone once lived, farmed, and enclosed their world against the wider countryside.

The site sits at the south-western end of the ridge, with the Mealagh River visible to the east. For anyone who does make their way here, the landscape does much of the interpretive work. The elevation is modest but deliberate, the kind of position an early medieval farmer would have chosen for drainage, visibility, and proximity to water without the risk of flooding. The earthwork itself may be nearly invisible, but the logic of its placement remains entirely readable.